Hello! I use Drupal 6 + ImageCache+ Date api

When I upload image files I see warning message:

[CODE]
* warning: Parameter 2 to date_form_alter() expected to be a reference, value given in /usr/share/drupal6/includes/common.inc on line 2839.
* warning: Parameter 2 to date_timezone_form_alter() expected to be a reference, value given in /usr/share/drupal6/includes/common.inc on line 2839.[/CODE]

How it fix?

Thanks!